AMD vs. Pentium Chip

I am looking at building another PC for trading. I have seen the new XPC (Small form factor) boxes by Shuttle. They look very interesting. They have a P4 or AMD motherboard. The AMD is built on the new Nvidia N-force 2 chipset with dual video output.
Question for other computer builders, is there a big difference between using an AMD processor or Intel Pentium 4?

I concur with Longshot, but I had to send back a shuttle board.
Got an MSI no problems. I'd imagine that onboard nvidea chip uses shared mem? Not sure. Good time to be building great bang for your buck.